The last reported case of smallpox in the-- naturally occurring smallpox, was in 1977, a man in Somalia was infected.
最后一例天花报告,自然产生的天花,是在一九七七年,一个索马里人感染了
I alluded to this a little bit in the first class about how humans have evolved to seek out energy because famine was the largest threat is one example of this.
第一节课的时候我提到了,人类是如何演化以便寻找能量,因为饥荒是最大的威胁,这是其中一例
Another example is cystic fibrosis.
另一例是囊胞性纤维症
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